Accession Number : ADA303878

Title :   MESFET Grid Oscillators - Injection-Locking, Power Design and Modulation.

Descriptive Note : Final rept. 1 Jun 92-30 Nov 95,

Corporate Author : COLORADO UNIV AT BOULDER DEPT OF ELECTRICAL AND COMPUTER ENGINEERING

Personal Author(s) : Popovic, Zoya B.

PDF Url : ADA303878

Report Date : 31 DEC 1995

Pagination or Media Count : 7

Abstract : A pc-based program was developed for design-oriented analysis of grid oscillator power combiners. The program was also extended to analysis of arbitrary cascaded quasi-optical active and/or passive components. Validation on passive unloaded gratings, passive loaded gratings and active gratings has been carried out and analysis agrees with measurements favorably. Grid oscillators designed using this theory have been implemented as sources in a two-level power-combining system consisting of a grid oscillator source and a lens amplifier combiner. Lens amplifier can provide power gain with good feed efficiency, as well as beam-steering, beam forming and beam switching capabilities. Grid oscillators were also extended to a I three-dimensional power combining source with power-combining efficiencies above 70%. Injection-locking properties of grid oscillators were studied, and it was established that these components work well as self-oscillating harmonic and subharmonic mixers. I This enables receivers which use quasi-optical components and do not require a separate LO. The heat dissipation in 2-D arrays was addressed by developing a high- efficiency amplifier array with 2.4W at 64% power-added efficiency at 5GHz. (AN)

Descriptors :   *ELECTROOPTICS, *FIELD EFFECT TRANSISTORS, *ANTENNA ARRAYS, OSCILLATORS, INJECTION, OPTIMIZATION, COMPUTER AIDED DESIGN, VALIDATION, PASSIVE SYSTEMS, EFFICIENCY, MILLIMETER WAVES, SEMICONDUCTORS, GRATINGS(SPECTRA), OPTICAL ANALYSIS, BEAM FORMING, POWER AMPLIFIERS, SYSTEMS ANALYSIS, OPTICAL SWITCHING, OPTICAL PROCESSING, BEAM STEERING, MICROWAVE FREQUENCY, HEAT LOSS, POWER DISTRIBUTION, VOLTAGE AMPLIFIERS, POWER GAIN.

Subject Categories : Electrical and Electronic Equipment
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE